I say Sakura, 'cause i dont like Karin. I want Ino to be with Kiba, but I doubt she's going to be with him.

EDIT: Now that I've seen more of the show and characters develop I have different opinions. I still think that Sakura would be the best for him, but I'm not fond of him anymore. Sakura could do better and Sasuke needs to set his priorities straight. If Sasuke is willing to I think that Sakura and Naruto might have a slight chance of changing him as a person. Karin has grown on me as a character and I would love to see her settle down somewhere with Suigetsu, especially if he reforms the Seven Ninja Swordsman of the Mist.